鼠标事件

0左键 1右键 2滚轮

鼠标点击事件实现的三种方式

1. Input.GetMouseButton
2. 利用事件接口，这种方式可以直接在UI上进行操作。

   UnityAction<BaseEventData> enter;
   UnityAction<BaseEventData> exit;
   UnityAction<BaseEventData> click;
   EventTrigger.Entry entry;
   EventTrigger.Entry entry1;
   EventTrigger.Entry entry2;
   EventTrigger trigger;
   void Start()
   {
       enter = new UnityAction<BaseEventData>(OnPointerEnterDelegate);
       exit = new UnityAction<BaseEventData>(OnPointerExitDelegate);
       click = new UnityAction<BaseEventData>(OnPointerClickDelegate);
       trigger = gameObject.AddComponent<EventTrigger>();
       
       entry = new EventTrigger.Entry();
       entry1 = new EventTrigger.Entry();
       entry2 = new EventTrigger.Entry();
       
       entry.eventID = EventTriggerType.PointerEnter;
       entry1.eventID = EventTriggerType.PointerExit;
       entry2.eventID = EventTriggerType.PointerClick;
       
       entry.callback.AddListener(enter);
       entry1.callback.AddListener(exit);
       entry2.callback.AddListener(click);
       
       trigger.triggers.Add(entry);
       trigger.triggers.Add(entry1);
       trigger.triggers.Add(entry2);
   }
   public void OnPointerClickDelegate(BaseEventData data){}
   public void OnPointerEnterDelegate(BaseEventData data){}
   public void OnPointerExitDelegate(BaseEventData data){}
   

3. 挂脚本，直接实现OnMouseDown函数

进度条更新太快

不要使用onvaluechange，而要使用OnEventTriggerEvent，它表示结束拖动滚动条。

onValueChanged变化太快：

        progress.onValueChanged.AddListener(v =>
        {
            var p = videoPlayerObj.GetComponent<VideoPlayer>();
            if (p.canSetTime)
            {
                p.time = v * p.length;
            }
        });

C#中使用扩展方法为所有的UI空间指定事件回调：

public static class UIBehaviourExtension
{
    /// <summary>
    /// 添加EventTrigger事件监听
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="self"></param>
    /// <param name="type"></param>
    /// <param name="action"></param>
    /// <returns></returns>
    public static T OnEventTriggerEvent<T>(this T self, EventTriggerType type, UnityAction<BaseEventData> action) where T : UIBehaviour
    {
        var eventTrigger = self.GetComponent<EventTrigger>() ?? self.gameObject.AddComponent<EventTrigger>();
        EventTrigger.Entry entry = new EventTrigger.Entry { eventID = type };
        entry.callback.AddListener(action);
        eventTrigger.triggers.Add(entry);
        return self;
    }
}

使用的时候直接x.OnEnventTriggerEvent即可。